Refugial occurrence and ecology of the land snail Vertigo lilljeborgi in fen habitats in temperate mainland Europe

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Authors

HORSÁK Michal HÁJEK Michal HORSÁKOVÁ Veronika HLAVÁČ Jaroslav HÁJKOVÁ Petra DÍTĚ Daniel PETERKA Tomáš DIVÍŠEK Jan POTŮČKOVÁ Anna PREECE Richard

Year of publication 2017
Type Article in Periodical
Magazine / Source Journal of Molluscan Studies
MU Faculty or unit

Faculty of Science

Citation
Doi http://dx.doi.org/10.1093/mollus/eyx028
Field Zoology
Keywords Vertigo lilljeborgi; relict occurrences; land snail; Europe; ecology; distribution
Description Vertigo lilljeborgi (Westerlund, 1871) is one of the rarest terrestrial snail species in temperate mainland Europe, where it is traditionally considered a glacial relict. This contrasts with its occurrence in northern Europe where it is a widespread species. This species prefers constantly wet habitats that are neutral to slightly acidic and avoids highly alkaline conditions, which is an extremely rare ecology for a Eurasian mollusc. Until 2012, only five historical records of this species were known in mainland Europe to the south of its main distribution in northern Europe. Since then, 20 new sites have been discovered, mostly located in the Hercynian Mountains (Bohemian Massif in the Czech Republic and Massif Central in France). In comparison with the boreal European and Alpine populations, those from the Hercynian Mountains inhabit acidic, rather soligenous and productive fens, strongly dominated by Sphagnum. Vertigo lilljeborgi does not occur in some sites with apparently suitable habitats as indicated by species composition of the vegetation. We observed a surprising correspondence between the occurrence of V. lilljeborgi and mean July air temperature and we report its first fossil record from the last glacial period from Central Europe. Although the number of its sites has increased recently, these sites represent highly unusual and unique habitats, vulnerable to drainage and destruction from human activities. This highlights the need for conservation efforts in most of the newly discovered isolated sites.
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